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POP3 account cannot send to external recipient using Exchange Server 2003

Dear all

I'd appreciate if you could help.

I recently find out that the user especially smartphone user using POP3 for sending and receiving message. they reported that they cannot send email to external recipient without VPN or outside company network, e.g. at home.

I tried using Outlook Express or MS Outlook 2003, it is true that the message can ONLY send to internal recipient. Unless my smtp account is set to SMTP server given by my local ISP, then I can send to external and internal recipient. I went for business trip recently, I find out that I cannot send email in and out, I change SMTP server to my Exchange Server's public IP. I can only send to internal recipient but not external. So I called for that country ISP, change my SMTP server settings again, it works for in and out.

I start to realize that it is very inconvenience to cause that I have to know their own smtp servers of different ISP.

I would be good if SMTP account authenticated successfully through my Exchange Server 2003, it can be send in and out to internal and external recipient. So that, I won't require to know other SMTP server.

Anyone encounter? Any solution for me?
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chekfu
Asked:
chekfu
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1 Solution
 
SpydergtCommented:
Sounds like an issue with the smtp connector.  Im not sure about 2003 but in 2007 you need to set up special permissions in the smtp receive connector.
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chekfuAuthor Commented:
If possible, do let me know the settings of Exchange 2007 if it is similar to my encountered issue.

Dear all
Have you an idea on how resolve it? I believed that it was nothing wrong for the settings but default design settings in Exchange Sever 2003.

Thanks in advanced!
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wolfcamelCommented:
sounds like you need to authenticate to be able to relay - which is ideal to prevent your sever being an open relay.
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chekfuAuthor Commented:
Yes, can it be possible to relay using user authentication rather than ip address? For long as, user and password are correct for authentication to exchange server, it allows to relay.
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wolfcamelCommented:
in the smtp virtual server properties, access, relay, users button - make sure authenticated users is selected, and check the allow all computer chich successfully authentice to relay regardless of list above.

MAKE sure you have decent password policies or you will be relaying spam in no time
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chekfuAuthor Commented:
I've just checked that the checkbox "Allow All computer which successfully...." is already ticked.

Users button is dimmed when above checkbox is ticked. However, I've checked that Authenticated Users are shown in the list.

Any other advice. Thanks in advanced!
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wolfcamelCommented:
some(aka MANY)  isps filter/block smtp so you have to use their smtp servers - this can be a nuisance - to which the only solution is vpn.
For some of my users that regularly travel to the same locations I have set dummy smtp accounts so they can send using the account for the location they are in - using the local ISPs smtp server to send (unauthenticated)
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chekfuAuthor Commented:
I recently upgrade to Exchange Server 2007. The issue encountered in Exchange 2003 last time was then resolved also.
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